Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers

Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers

The present invention relates to an active substance composition for changing the shape and modifying the surface of human hair. The invention relates in particular to a cosmetic product for treating keratin material, comprising a) at least one organic silicon compound and b) at least one polycarboxylic acid, wherein the cosmetic agent is particularly suitable for providing structural heat protection.